[Issue 3981] More useful and more clean 'is'

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3981



--- Comment #1 from bearophile_hugs at eml.cc 2010-03-17 07:38:16 PDT ---
So this assert should never fail (from a comment by grauzone):

T x;
assert(x is T.init);

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